path: root/arch/arm/lib/bitops.h
AgeCommit message (Collapse)Author
2011-02-19ARM: 6653/1: bitops: Use BX instead of MOV PC,LRDave Martin
The kernel doesn't officially need to interwork, but using BX wherever appropriate will help educate people into good assembler coding habits. BX is appropriate here because this code is predicated on __LINUX_ARM_ARCH__ >= 6 Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-02ARM: bitops: switch set/clear/change bitops to use ldrex/strexRussell King
Switch the set/clear/change bitops to use the word-based exclusive operations, which are only present in a wider range of ARM architectures than the byte-based exclusive operations. Tested record: - Nicolas Pitre: ext3,rw,le - Sourav Poddar: nfs,le - Will Deacon: ext3,rw,le - Tony Lindgren: ext3+nfs,le Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Will Deacon <will.deacon@arm.com> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-02ARM: bitops: ensure set/clear/change bitops take a word-aligned pointerRussell King
Add additional instructions to our assembly bitops functions to ensure that they only operate on word-aligned pointers. This will be necessary when we switch these operations to use the word-based exclusive operations. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-13Complete irq tracing support for ARMUwe Kleine-König
Before this patch enabling and disabling irqs in assembler code and by the hardware wasn't tracked completly. I had to transpose two instructions in arch/arm/lib/bitops.h because restore_irqs doesn't preserve the flags with CONFIG_TRACE_IRQFLAGS=y Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2009-05-28[ARM] barriers: improve xchg, bitops and atomic SMP barriersRussell King
Mathieu Desnoyers pointed out that the ARM barriers were lacking: - cmpxchg, xchg and atomic add return need memory barriers on architectures which can reorder the relative order in which memory read/writes can be seen between CPUs, which seems to include recent ARM architectures. Those barriers are currently missing on ARM. - test_and_xxx_bit were missing SMP barriers. So put these barriers in. Provide separate atomic_add/atomic_sub operations which do not require barriers. Reported-Reviewed-and-Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-20[ARM] spelling fixesSimon Arlott
Spelling fixes in arch/arm/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-06-30Remove obsolete #include <linux/config.h>Jörn Engel
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2005-11-09[ARM] Clean up save_and_disable_irqs macro and allow use of ARMv6 CPSIDRussell King
save_and_disable_irqs does not need to use mov + msr (which was introduced to work around a documentation bug which was propagated into binutils.) Use msr with an immediate constant, and if we're building for ARMv6 or later, use the new CPSID instruction. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-03[ARM SMP] Add configuration option for ARMv6K processorsRussell King
The 'K' extension adds several new instructions to the ARMv6 ISA which are primerily useful for SMP. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-08-10[ARM SMP] Only enable V6K instructions on V6 MP core CPUsRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-07-28[ARM SMP] Fix another ARMv6 bitop problemRussell King
We sometimes forgot to check whether the exclusive store succeeded. Ensure that we always check. Also ensure that we always use the out of line versions, since the inline versions are not SMP safe. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-07-27[ARM SMP] Fix data corruption in test_* bitopsRussell King
If we found that the bit was already in the desired state, we would skip performing the operation, and write random data back. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-07-16[PATCH] ARM: Convert bitops to use ARMv6 ldrex/strex instructionsRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-04-18[PATCH] ARM: Add missing new file for bitops patchRussell King
Signed-off-by: Russell King <rmk@arm.linux.org.uk>